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<h2>
<span class="refentrytitle">cell</span>
</h2>
<p>cell —
Cellular Automaton
</p>
</div>
<div class="refsect1">
<a id="idm281472948012568"></a>
<h2>Description</h2>
<p>
One-Dimensional Cellular Automaton. This opcode is the
modified version of <span class="emphasis"><em>vcella</em></span> by Gabriel Maldonado.
</p>
</div>
<div class="refsect1">
<a id="idm281472948008696"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>cell</strong></span> ktrig, kreinit, ioutFunc, initStateFunc, iRuleFunc, ielements</pre>
</div>
<div class="refsect1">
<a id="idm281472948006680"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ioutFunc</em></span> -- number of the table where the state of each cell is stored.
</p>
<p>
<span class="emphasis"><em>initStateFunc</em></span> -- number of the table
containing the inital states of cells.
</p>
<p>
<span class="emphasis"><em>iRuleFunc</em></span> -- number of a lookup table
containing the 8-bit rule.
</p>
<p>
<span class="emphasis"><em>ielements</em></span> -- total number of cells in a row.
</p>
</div>
<div class="refsect1">
<a id="idm281472947941704"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>ktri</em></span> -- trigger signal. Each time it is
non-zero, a new generation of cells is evaluated.
</p>
<p>
<span class="emphasis"><em>kreinit</em></span> -- reset signal. Each time it is
non-zero, state of all cells is forced to be that of
initStateFunc.
</p>
<p>
<span class="emphasis"><em>cell</em></span> models a classical 1D cellular
automaton and stores the state of each cell in the table
identified by <span class="emphasis"><em>ioutFunc</em></span>.
</p>
<p>
<span class="emphasis"><em>initStateFunc</em></span> is an input vector containing
the inital value of the row of cells, while
<span class="emphasis"><em>iRuleFunc</em></span> is an input vector containing the
chosen rule in the binary form (least significant bit first).
</p>
<p>
A new generation of cells is evaluated each time
<span class="emphasis"><em>ktrig</em></span> contains a non-zero value. Also the
status of all cells can be forced to assume the status
corresponding to the contents of
<span class="emphasis"><em>initStateFunc</em></span> each time
<span class="emphasis"><em>kreinit</em></span> contains a non-zero value.
</p>
<p>
Note that each cell is supposed to be in one of two possible
states (1 = "alive", 0 = "dead"), although fractional values
should work too, because truncation is used.
</p>
</div>
<div class="refsect1">
<a id="idm281472947933704"></a>
<h2>Examples</h2>
<p>
Here is a simple example of the cell opcode. It uses the file
<a class="ulink" href="examples/cell.csd" target="_top"><em class="citetitle">cell.csd</em></a>.
</p>
<div class="example">
<a id="idm281472947931832"></a>
<p class="title">
<strong>Example 109. A simple example of the cell opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<div class="refsect1">
<a id="idm281472781742472"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
<span class="c1">;-odac -iadc ;;;RT audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o cell.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">; cell.csd by Gleb Rogozinsky</span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1">; Cellular automaton-driven synthesis in spectral domain</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">att</span> <span class="o">=</span> <span class="nb">p4</span> <span class="c1">; envelope attack time</span>
i<span class="n">sus</span> <span class="o">=</span> <span class="nb">p5</span> <span class="c1">; envelope sustain time</span>
i<span class="n">rel</span> <span class="o">=</span> <span class="nb">p6</span> <span class="c1">; envelope release time</span>
i<span class="n">vol</span> <span class="o">=</span> <span class="nb">p7</span> <span class="c1">; overall volume</span>
<span class="c1">; create some white noise</span>
a<span class="n">sig</span> <span class="nb">rand</span> <span class="mf">0.8</span>
<span class="c1">; spectral analysis of asig</span>
<span class="n">fsig</span> <span class="nb">pvsanal</span> a<span class="n">sig</span><span class="p">,</span> <span class="mi">2048</span><span class="p">,</span> <span class="mi">1024</span><span class="p">,</span> <span class="mi">2048</span><span class="p">,</span> <span class="mi">0</span> <span class="c1">; get a vector of magnitudes</span>
<span class="c1">; calculate cellular automaton state</span>
k<span class="n">freq</span> <span class="nb">line</span> <span class="mi">50</span><span class="p">,</span> <span class="mi">5</span><span class="p">,</span> <span class="mi">1</span> <span class="c1">; variable CA triggering frequency</span>
k<span class="n">trig</span> <span class="nb">metro</span> k<span class="n">freq</span> <span class="c1">; trigger the CA to update cells</span>
<span class="nb">cell</span> k<span class="n">trig</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">3</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">2</span><span class="p">,</span> <span class="mi">2048</span> <span class="c1">; cells are written into ftable 3 </span>
<span class="c1">; use current row of cells in spectral domain</span>
<span class="n">fmas</span> <span class="nb">pvstencil</span> <span class="n">fsig</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">3</span> <span class="c1">; apply spectral mask </span>
a<span class="n">out</span> <span class="nb">pvsynth</span> <span class="n">fmas</span> <span class="c1">; reconstruct time signal </span>
<span class="c1">; apply envelope and out signal</span>
k<span class="n">env</span> <span class="nb">expseg</span> <span class="mf">.001</span><span class="p">,</span> i<span class="n">att</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> i<span class="n">sus</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> i<span class="n">rel</span><span class="p">,</span> <span class="mf">.001</span>
<span class="nb">out</span> a<span class="n">out</span><span class="o">*</span>k<span class="n">env</span><span class="o">*</span>i<span class="n">vol</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; This example uses one-dimensional cellular automaton</span>
<span class="c1">; to produce structures in spectral domain</span>
<span class="c1">; We have to prepare initial row of cells.</span>
<span class="c1">; One alive cell is enough to produce a simple fractal,</span>
<span class="c1">; so two alivee cells will make structure more sophisticated</span>
<span class="nb">f</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">2048</span> <span class="mi">7</span> <span class="mi">0</span> <span class="mi">150</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">1</span> <span class="mi">1</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">45</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">1</span> <span class="mi">1</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">0</span>
<span class="c1">; The CA rule is used as follows:</span>
<span class="c1">; the states (values) of each cell are summed with their neighboring cells.</span>
<span class="c1">; Each sum is used as an index to read a next state of cell</span>
<span class="c1">; from the rule table.</span>
<span class="c1">; Let us try rule # 129 (LSB binary 1 0 0 0 0 0 0 1).</span>
<span class="c1">; This rule will produce a fractal structure for single active cell</span>
<span class="c1">; For more rules see http://mathworld.wolfram.com/ElementaryCellularAutomaton.html</span>
<span class="nb">f</span><span class="mi">2</span> <span class="mi">0</span> <span class="mi">8</span> <span class="o">-</span><span class="mi">2</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">0</span> <span class="mi">1</span>
<span class="c1">; Try some different rules i.E. 254 (0 1 1 1 1 1 1 1) or 169 (1 0 0 1 0 1 0 1)</span>
<span class="c1">; Prepare the output table of ielements size</span>
<span class="nb">f</span><span class="mi">3</span> <span class="mi">0</span> <span class="mi">2048</span> <span class="mi">10</span> <span class="mi">0</span>
<span class="c1">; Time to make it sound!</span>
<span class="nb">i</span><span class="mi">1</span> <span class="mi">0</span> <span class="mi">13</span> <span class="mf">0.3</span> <span class="mi">7</span> <span class="mi">3</span> <span class="mi">1</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
</div>
</div>
<p><br class="example-break" />
</p>
</div>
<div class="refsect1">
<a id="idm281472947927544"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Gleb Rogozinsky</td>
</tr>
<tr>
<td>October 2011</td>
</tr>
</table>
<p>
</p>
<p>New in Csound version 5.16.6</p>
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